Cement board on a slab?

I have an a little over an inch to make up and am wondering if I can use a layer or two of cement board to do this or if it is better to use a dry pack. I will be making up the difference then laying heat mat on top and covering with self leveling. The floor consists of 1" he. Mats
2 ways to accomplish this=
1. Dry pack the mat and self leveling to proper subfloor height
2. Instal cement board right on the slab then heat mat and self leveling to proper height. I thought of skimming the floor with thunder then setting the board in this and if 2 layers needed buttering thin set on this and turning the sheet perpendicular....
I think the board is faster/cheaper and easier but don't know if its ok to do. First time laying this type of floor and looking for easiest best way for positive results

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Cement board on a slab?

Fair enough- that seems to be the answer- I guess I was looking for an easy answer- the lack of math and ease of time and energy-- the area isn't huge but big enough (5'x15'). Does deck mud calculate the same for coverage as say concrete?

Cement board on a slab?

Quote:

Originally Posted by oh'mike

.....masons mortar is often used for a job like that----and premixed deck mud is available at many tile stores.

NO NO NO! Mike, surely you didn't mean to write "premixed" deck mud. I'm sure you meant to say "preblended" in bag, ready to be mixed. Premixed will be interpreted as it's already in paste form and we don't want that.

Mason's mortar is ok for walls and shower curbs where a sticky paste is what you want. Floors get deck mud which is sand/cement only.

Jaz

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